JPH07224946A - Sealing device - Google Patents

Abstract

PURPOSE:To prevent deformation of a seal lip even if a holding member is deformed by any external influence. CONSTITUTION:A sealing device main body (a) which is provided with a lip part 2 serving as a seal lip and a metal annulus 3 serving as a reinforcing annulus for supporting the lip part 2, is fixed to an installing part through a retainer 1 serving as a holding member for holding the sealing device main body (a), the sealing device main body (a) is integrated with the retainer 1 through an elastic member, and the sealing device main body (a) is floating- supported in relation to the retainer 1 by the elastic member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for sealing between an engine block and a crankshaft, for example, a retainer, a cover and the like and a lip portion.

[0002]

2. Description of the Related Art As a conventional sealing device of this type, for example, one shown in FIG. 6 is known.

FIG. 6 is a cross-sectional view of a sealing device A'applied to an engine block in which an engine body (not shown) is housed, and a metal retainer 101 as a holding member,
The retainer 101 is integrally formed with a lip portion 102 made of a rubber-like elastic body as a seal lip.

The retainer 101 has a fixing bolt 111.
Is fixed to the engine block 107, an O-ring groove 109 is formed on the contact surface with the engine block 107 to prevent oil leakage, and an O-ring 110 is attached.

Further, the lip portion 102 is provided with a lip tip portion 102a which is brought into sliding contact with the outer peripheral surface of the shaft 106 to seal it, and an auxiliary lip 102b on the atmosphere side of the lip tip portion 102a. It is integrated so as to be connected to the retainer 101 at the portion 101a. On the other hand, a spring 105 for adjusting the pressing force on the shaft 106 is provided on the outer peripheral side of the lip tip portion 102a.

[0006]

However, in the above-mentioned conventional sealing device, the retainer 101 as a holding member is deformed due to external influences such as tightening the fixing bolt 111 with a high torque and heat transfer from the engine. (When the retainer is made of resin, the deformation is further increased.) When the retainer 101 is deformed, the lip portion 102 is deformed. Further, when the retainer is made of resin, the deformation that occurs when the resin hardens after the molding is further transmitted to the lip portion 102. Due to such deformation of the lip portion 102, a gap may be formed between the outer peripheral surface of the shaft 106 and the lip tip portion 102a, or the contact state with the shaft 106 may be deviated due to misalignment to become unstable.
It causes abnormal wear. As a result, the sealing performance of the sealing device A ′ is deteriorated, causing problems such as oil leakage.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a sealing device in which the seal lip does not deform even when the holding member is deformed under the influence of the outside. To provide.

[0008]

In order to achieve the above object, in the present invention, a sealing device body having a seal lip and a reinforcing ring for supporting the sealing lip is held by the sealing device body. In a sealing device fixed to a mounting portion via a holding member, the sealing device body is integrated with the holding member via an elastic member, and the sealing device body is floatingly supported by the elastic member with respect to the holding member. Is characterized by.

Further, it is preferable that the holding member is made of resin, and the sealing device main body to which the elastic member is fixed in advance is integrally formed with the holding member by insert molding.

The elastic member may be a rubber-like elastic material.

[0011]

According to the sealing device constructed as described above, the sealing device main body is integrated with the holding member via the elastic member, and the sealing member main body is floatingly supported with respect to the holding member by the elastic member. Even if is deformed, the elastic member absorbs the deformation.

Further, the holding member is made of resin, and the sealing device main body to which the elastic member is fixed in advance is integrally formed with the holding member by insert molding, so that the integration is facilitated.

By using a rubber-like elastic material as the elastic member, the main body of the sealing device and the holding member can be more easily integrated via the elastic member.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments.

FIG. 1 shows an embodiment of a sealing device according to the present invention, which is applied to an engine block.
Is a front view, (b) is a side view, (c) is Z in (a).
It is a -Z sectional view.

In FIG. 1, the sealing device A includes an engine block 7 in which an engine body (not shown) is housed,
The shaft 6 protruding from the engine block 7 is sealed.

The sealing device A includes a retainer 1 as a resin holding member, a metal ring 3 as a reinforcing ring, and a rubber-like elastic lip portion 2 as a seal lip formed on the outer periphery of the metal ring 3. The sealing device main body a, which is composed of 1), is integrated, and the retainer 1 is positioned on the engine block 7 by the two positioning pins 12, and the fixing bolt 11
Is fixedly attached to the mounting portion, and the outer peripheral surface of the shaft 6 is slidably contacted with the lip portion 2 for sealing.

An oil pan 8 for storing oil is attached to the lower portion of the engine block 7 via a plurality of oil pan bolts 13.

FIG. 2A is an enlarged sectional view in which the sectional view shown in FIG. 1C is enlarged in order to explain the structure of the sealing device A in detail, and FIG. FIG. 3 is a sectional view of the lip portion 2 alone.

2 to 3, the lip portion 2
Is a cross-section substantially L including an inward flange portion 3a and a cylindrical portion 3b.
Metal ring 3 as a V-shaped annular core metal, and this metal ring 3
It consists of a plurality of lips made of rubber-like elastic body formed around the periphery of, and explaining the plurality of lips,
From the inner peripheral side of the inward flange portion 3a of the metal ring 3, a lip tip portion 2a is formed in a direction in which the diameter becomes small and the cylindrical portion 3b extends, and an auxiliary lip 2d is formed at a position on the atmosphere side when mounted, and the inward flange portion 3a. At the joint between the cylindrical portion 3b and the cylindrical portion 3b, the outer peripheral protruding first lip 2b has a wall thickness t2b at its tip and a wall thickness t2 at the neck portion in a direction in which the diameter becomes large and extends in the direction opposite to the cylindrical portion 3b.
It is molded so as to be larger than b ′, and further, the cylindrical portion 3
An outer peripheral projecting second lip 2c is formed at the tip of b so as to have a large diameter and in the direction in which the cylindrical portion 3b extends so that the wall thickness t2c at the tip thereof is larger than the wall thickness t2c 'at the neck.

The method of manufacturing the sealing device A will be described. First, around the metal ring 3, the lip tip 2a, the outer peripheral protruding first lip 2b, the outer peripheral protruding second lip 2c, the auxiliary lip 2d, etc. The lip portion 2 is molded with a rubber-like elastic body so as to have a sectional structure as shown in the above-mentioned drawing. Next, with the formed lip portion 2 placed on a predetermined position of a forming die for forming the retainer 1, the outer peripheral protruding first and second lips 2b, 2c on the lip portion 2 are formed.
At the same time, it is insert-molded with resin so as to cover the outer peripheral side thereof, but at this time, in order to apply pressure in a balanced manner to the lip portion 2 from both left and right sides in FIG.
As shown in FIG. 2 (b), ribs 4 are formed around the entire circumference in a radial shape at substantially equal intervals. The rib 4 serves to balance the pressure when the retainer 1 is molded, and the rib 4 may have any shape, and of course the retainer 1 can be molded. In this way, the retainer 1 and the lip portion 2 are integrated. Molding heat is generated in this molding, but the rubber-like elastic body of the lip portion 2 is not affected because it is a material having high heat resistance.

The sealing device A thus manufactured is shown in FIG.
As shown in (1), the outer peripheral projecting first lip 2b and the outer peripheral projecting second lip 2c are connected and integrated by the connecting portion 1a of the retainer 1 in a state where the outer peripheral projecting second lip 2c is surely covered with resin without a gap.

A spring 5 for adjusting the pressing force to the shaft 6 is provided on the outer peripheral side of the lip tip portion 2a of the lip portion 2 of the sealing device A, and the fixing bolts are respectively attached to the plurality of bolt holes 1b in the retainer 1. 11 is inserted, tightened, and mounted as shown in FIG. Also in this embodiment, an O-ring groove for preventing oil leakage as shown in the conventional example may be formed on the contact surface of the retainer 1 with the engine block 7.

With this structure, even if the retainer 1 is deformed by an external influence, the lip 2 has the metal ring 3 as the core metal, so that the deformation of the lip 2 is significantly suppressed. Furthermore, since there is the metal ring 3 in the connecting portion 1a of the retainer 1 via the outer peripheral projecting first and second lips 2b and 2c, the strain of the retainer 1 is the outer projecting first
Also, it is absorbed by the second lips 2b and 2c and is less likely to be transmitted to the metal ring 3, so that the deformation of the lip portion 2 can be prevented.

Further, there is a floating effect that the deformation of the lip portion 2 can be prevented as described above even if the resin is deformed when it is solidified after the resin molding.

In this embodiment, the metal ring is used as the ring-shaped core metal, but the metal core is not limited to the metal ring and may be any one that is not easily affected by the deformation of the retainer, for example, a resin such as ceramic. Further, the shape of the rubber-like elastic body at the joint portion between the retainer and the lip portion may be any shape as long as strain of the retainer is difficult to be transmitted to the metal ring, and the outer peripheral protruding first and second lips 2b, 2c as in the present application can be formed. It is not limited to such a shape.

(Other Embodiments) FIG. 4 is a sectional view showing another embodiment of the sealing device A. Also, FIG. 5 shows the lip portion 2.
It is sectional drawing of a single body. In this embodiment, the shape of the metal ring 3 of the above-mentioned embodiment is changed, and the difference is the same as that of the above-mentioned embodiment except the difference in shape.

In FIGS. 4 to 5, the lip portion 2
Is a metal ring 3 as a reinforcing ring having a substantially hat shape with a hole formed of an inward flange portion 3a, a cylindrical portion 3b, and an outer peripheral flange portion 3c, and a rubber-like elastic body formed around the metal ring 3 and provided. The plurality of lips will be described. The plurality of lips will be described. The lip tip portion in the direction in which the diameter becomes small and the cylindrical portion 3b extends from the inner peripheral side of the inward flange portion 3a of the metal ring 3 as in the above-described embodiment. 2a, an auxiliary lip 2d is formed at a position that is on the atmosphere side when mounted, and an outer peripheral projection is formed in a joint portion between the inward flange portion 3a and the cylindrical portion 3b, which has a large diameter and extends in the direction opposite to the cylindrical portion 3b. The first lip 2b is formed such that the wall thickness t2b at the tip thereof is larger than the wall thickness t2b 'of the neck portion, and further, in the outer peripheral direction on the outer peripheral side of the outer peripheral flange portion 3c extending from the front end of the cylindrical portion 3b. The outer peripheral projecting second lip 2c is formed so that the wall thickness of the tip is increased. This metal ring 3 is provided with the outer peripheral flange portion 3c, so that
It became harder to deform than the example. In addition, this metal ring 3
Is mainly intended to prevent deformation of the lip portion 2, and the shape is not limited to this, and any shape that can prevent deformation of the lip portion 2 may be used.

With this structure, even if the retainer 1 is deformed by external influences, the lip portion 2 has the metal ring 3 which is less likely to be deformed than the first embodiment.
Deformation of the lip portion 2 is remarkably suppressed, and furthermore, in the connecting portion 1a of the retainer 1, there is the metal ring 3 via the outer peripheral protruding first and second lips 2b and 2c, so that the retainer 1
Is absorbed by the outer peripheral projecting first and second lips 2b and 2c and is less likely to be transmitted to the metal ring 3, and deformation of the lip 2 can be prevented.

Further, even if the resin is deformed after it is molded and the resin is hardened, the lip portion 2 can be prevented from being deformed as described above, which has a floating effect.

[0031]

According to the present invention having the above-described structure and operation, the sealing device body is integrated with the holding member via the elastic member, and the sealing device body is supported by the elastic member in a floating manner. Even if the holding member is deformed, the elastic member absorbs the deformation and the seal lip can be deformed, which is a floating effect.

Further, since the holding member is made of resin and the sealing device main body to which the elastic member is fixed in advance is integrally formed with the holding member by insert molding, the integration becomes easy and the cost can be reduced.

By using a rubber-like elastic material as the elastic member, the main body of the sealing device and the holding member can be more easily integrated via the elastic member, and the cost can be reduced.

[Brief description of drawings]

1 (a), (b), and (c) are a front view, a side view, and a sectional view of a main part of an engine block to which a sealing device according to an embodiment of the present invention is applied.

FIG. 2 (a) is an enlarged sectional view of FIG. 1 (c), (b).
FIG. 4 is a side view showing the state of ribs 4.

3 is a cross-sectional view of a single lip portion 2 in FIG.

FIG. 4 is a sectional view of an essential part of a sealing device according to another embodiment of the present invention.

5 is a cross-sectional view of the lip portion 2 alone in FIG.

FIG. 6 is a cross-sectional view showing a conventional sealing device.

[Explanation of symbols]

 A, A ′ Sealing device a Sealing device main body 1,101 Retainer (holding member) 1a, 101a Connection part 1b Bolt hole 2 Lip part (seal lip) 2a, 102a Lip tip part 2b Peripheral protrusion-shaped first lip 2c Peripheral protrusion-shaped 2nd lip 2d, 102d Auxiliary lip 3,103 Metal ring (reinforcing ring) 3a Inward flange part 3b Cylindrical part 3c Outer peripheral flange part 4 Rib 5,105 Spring 6,106 Shaft 7,107 Engine block 8 Oil pan 11,111 Fixed Bolt 12 Positioning pin 13 Oil pan bolt 109 O-ring groove 110 O-ring

Claims (3)

[Claims] 1. A sealing device for fixing a sealing device main body, comprising a sealing lip and a reinforcing ring supporting the sealing lip, to a mounting portion via a holding member for holding the sealing device main body, wherein the sealing device main body is provided. Is integrated with the holding member via an elastic member, and the sealing device main body is floatingly supported with respect to the holding member by the elastic member. 2. The sealing device according to claim 1, wherein the holding member is made of resin, and the sealing device main body to which the elastic member is fixed in advance is integrally molded with the holding member by insert molding. 3. The sealing device according to claim 1, wherein the elastic member is a rubber-like elastic material.